Examine source code of Audio Notifier

{
  "manifest_version": 2,
  "name": "Audio Notifier",
  "version": "1.0",
  "description": "Plays an audio notification when triggered.",
  "permissions": [
    "notifications",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Audio Notifier"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{62894c79-bcc9-4b55-bf3a-5cb985e6a81f}"
    }
  }
}